Deprecate selected commands in kyma CLI

[kwiatekus]

Description

Warn users that kyma cli v2 is EOL
All current commands are deprecated and new v3 commands will be developed within alpha command group
Link decision

• Publish Whats new
• Introduce a warning at the beginning of readme.md
• Show warning message in the terminal when any kyma CLI command is executed

Reasons
Commands targeting development use cases will be removed from CLI. Those targeting end-users will undergo necessary adjustment to modular kyma. Those which bring little value comparing to maintanance cost will eventually be removed.
kyma-project/community#872

[kwiatekus]

• kyma deploy/undeploy (this one will be later reintroduced in alpha group to help installing modules)
• kyma init/run/sync/apply function
• kyma provision command group
• kyma create system
• kyma get schema
• kyma import group

[pPrecel]

Here is the article how to release old kyma-cli

[github-actions]

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